American trademark AISI440, Chinese trademark 9cr18, Hardness toreach 55~58 HRC, Specifications of diameter 2.0mm~40mm, which iswidely used in high-precision bearings, bearing-holders,sealing of precision products and refrigeration system, valves,instruments & meters, military fuse products, aero-space andaeronautical lines and other high precision mechanical parts.

Nonstandard dimensions customized are acceptable.

bearing ball